I was recently told that the reason my self icon is missing when I send and receive texts, since the 'update', is because my number is shown as 'not known' in the settings, whereas before the update, my number was there.

I found instructions on the net how to supposedly re-enter your own number manually in the phone's settings so it would once again show my own icon, but as far as I can see, there is no way to enter it on my phone!